OLED Connection Electrode Sealing Interlayer Insulation
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Solution Overview
Problem
Existing organic light emitting displays face challenges in sealing the interlayer insulating layer to prevent gas entry and maintain light emission functionality, particularly in non-light emission areas where the structure may allow gas to penetrate and degrade the organic light emitting diode.
Innovation Solution
The implementation of a connection electrode and auxiliary line structure with specific conductive layers and insulating layers that seal the interlayer insulating layer, including a first conductive layer with a ring shape and a second conductive layer with a polygonal shape, covering the insulating layer to prevent gas entry and ensure the integrity of the organic light emitting diode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the interlayer insulating layer is sealed using conventional methods, then the sealing effectiveness is insufficient, but the device complexity increases when using additional sealing structures
Solution Approach 1:
The connection electrode serves dual functions: it provides electrical connection between the cathode and auxiliary line, and simultaneously seals the interlayer insulating layer to prevent gas entry. This multi-functionality resolves the contradiction by achieving effective sealing without adding separate sealing structures, thus improving reliability while avoiding increased device complexity.
Solution Approach 2:
The sealing function is merged with the electrical connection function by designing the connection electrode to extend along the auxiliary line and cover the interlayer insulating layer. This integration eliminates the need for separate sealing components, resolving the contradiction between sealing effectiveness and device complexity.
2Reliability
If the connection electrode extends along the auxiliary line to seal the interlayer insulating layer, then gas entry is prevented, but the manufacturing precision requirements increase
Solution Approach 1:
The connection electrode is formed to extend along the auxiliary line in advance, creating a pre-positioned sealing structure. This preliminary action ensures that the electrode is already in place to prevent gas entry before the device operates, resolving the contradiction by establishing the gas barrier early while using standard fabrication processes to maintain reasonable manufacturing precision requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively seals the interlayer insulating layer, preventing gas entry and maintaining the light emitting function of the organic light emitting diode, thereby enhancing the reliability and longevity of the display.
Implementation Method 1
Excitons are generated when the holes and electrons recombine in the organic light emitting layer. Light is then emitted when the excitons change from an excited state to a ground state.
Data Source
AI summary
An organic light emitting display includes a driving transistor, an organic light emitting diode, an interlayer insulating layer, and a connection electrode. The interlayer insulating layer covers the driving transistor, and first and second via holes are formed in the interlayer insulating layer. The organic light emitting diode is on the interlayer insulating layer and connected to the driving transistor. The connection electrode is on the interlayer insulating layer and connected to an auxiliary line through the second via hole. The connection electrode surrounds a portion of the interlayer insulating layer together with the auxiliary line. The organic light emitting diode includes an anode connected to the driving transistor through the first via hole, an organic light emitting layer on the anode, and a cathode on the organic light emitting layer and connected to the auxiliary line through the connection electrode.